<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
    </style>
</head>

<body>
    <div id="app">
        <select v-model.number="num"  >
            <option value="1" >1人间</option>
            <option value="2" >2人间</option>
            <option value="3" >3人间</option>
        </select>        
        <hr>
        <input v-for="i in num"  type="text"  >

    </div>
    <script src="./js/vue.js"></script>

    <script>
        let vm = new Vue({
            el: "#app",
            data: {
               num:1
            }
        })

    </script>
</body>

</html>